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Article

Solid-State Dispersions of Platinum in the SnO2 and Fe2O3 Nanomaterials

1
Laboratory for Molecular Physics and Synthesis of New Materials, Ruđer Bošković Institute, Bijenička c. 54, 10000 Zagreb, Croatia
2
National Institute of Chemistry, Hajdrihova 19, SI-1001 Ljubljana, Slovenia
3
Radiation Chemistry and Dosimetry Laboratory, Ruđer Bošković Institute, Bijenička c. 54, 10000 Zagreb, Croatia
*
Authors to whom correspondence should be addressed.
Academic Editor: Francesc Viñes Solana
Nanomaterials 2021, 11(12), 3349; https://doi.org/10.3390/nano11123349
Received: 29 October 2021 / Revised: 1 December 2021 / Accepted: 7 December 2021 / Published: 10 December 2021
The dispersion of platinum (Pt) on metal oxide supports is important for catalytic and gas sensing applications. In this work, we used mechanochemical dispersion and compatible Fe(II) acetate, Sn(II) acetate and Pt(II) acetylacetonate powders to better disperse Pt in Fe2O3 and SnO2. The dispersion of platinum in SnO2 is significantly different from the dispersion of Pt over Fe2O3. Electron microscopy has shown that the elements Sn, O and Pt are homogeneously dispersed in α-SnO2 (cassiterite), indicating the formation of a (Pt,Sn)O2 solid solution. In contrast, platinum is dispersed in α-Fe2O3 (hematite) mainly in the form of isolated Pt nanoparticles despite the oxidative conditions during annealing. The size of the dispersed Pt nanoparticles over α-Fe2O3 can be controlled by changing the experimental conditions and is set to 2.2, 1.2 and 0.8 nm. The rather different Pt dispersion in α-SnO2 and α-Fe2O3 is due to the fact that Pt4+ can be stabilized in the α-SnO2 structure by replacing Sn4+ with Pt4+ in the crystal lattice, while the substitution of Fe3+ with Pt4+ is unfavorable and Pt4+ is mainly expelled from the lattice at the surface of α-Fe2O3 to form isolated platinum nanoparticles. View Full-Text
Keywords: platinum; hematite; cassiterite; ball-milling; mechanochemical; Fe2O3; SnO2; dispersion; XPS; STEM platinum; hematite; cassiterite; ball-milling; mechanochemical; Fe2O3; SnO2; dispersion; XPS; STEM
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MDPI and ACS Style

Radin, E.; Štefanić, G.; Dražić, G.; Marić, I.; Jurkin, T.; Pustak, A.; Baran, N.; Raić, M.; Gotić, M. Solid-State Dispersions of Platinum in the SnO2 and Fe2O3 Nanomaterials. Nanomaterials 2021, 11, 3349. https://doi.org/10.3390/nano11123349

AMA Style

Radin E, Štefanić G, Dražić G, Marić I, Jurkin T, Pustak A, Baran N, Raić M, Gotić M. Solid-State Dispersions of Platinum in the SnO2 and Fe2O3 Nanomaterials. Nanomaterials. 2021; 11(12):3349. https://doi.org/10.3390/nano11123349

Chicago/Turabian Style

Radin, Edi, Goran Štefanić, Goran Dražić, Ivan Marić, Tanja Jurkin, Anđela Pustak, Nikola Baran, Matea Raić, and Marijan Gotić. 2021. "Solid-State Dispersions of Platinum in the SnO2 and Fe2O3 Nanomaterials" Nanomaterials 11, no. 12: 3349. https://doi.org/10.3390/nano11123349

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